| Computer Code: |
GAP |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
[Obsolete: use CLG] Consist mainly of greywackes and siltstone with thick conglomerates and graptolitic shales. |
| Definition of Lower Boundary: |
Drawn at base of conglomerate of the Glen App Group (base not exposed). |
| Definition of Upper Boundary: |
Drawn at conformable upward passage from greywackes and siltstones of the Glen App Group to red-purple mudstones of the Tappins Group. |
| Thickness: |
At least 1400 metres (base not seen). |
| Geographical Limits: |
Strathclyde, Scotland. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Glen App Conglomerate [Obsolete Name and Code: Use GAP]
(-2814)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Glen App, south of the Stinchar Valley, Strathclyde, Scotland. |
| Reference(s): |
| Walton, E K. 1983. Lower Palaeozoic - Stratigraphy. In Craig, G Y (editor), Geology of Scotland (2nd edition)(Edinburgh: Scottish Academic Press.) |
| Williams, A and others, 1972. A correlation of Ordivician rocks in the British Isles. Geological Society of London Special Report No.3. |
| Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. |
| Cameron, I B, Stone, P and Smellie, J, 1986. Geology of the Country around Girvan. Explanation of 1:50 000 sheet. British Geological Survey, Sheet 7, Scotland. |
| Greig, D C. 1971. British Regional Geology: the South of Scotland (3rd Edition). (Edinburgh: HMSO for the Institute of Geological Sciences.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
